CN101494920A - Method for forming channel matrix of distributed MIMO district multi-hop refile - Google Patents
Method for forming channel matrix of distributed MIMO district multi-hop refile Download PDFInfo
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Abstract
The invention discloses a channel matrix measuring method and system used in distributed virtual MIMO cell multi-hop refile, which comprises: The main terminal in the cell accomplishes channel measurement preparation by initialization; by using the existing channel measurement mode, the terminal in the cell can obtain measured channel information; then, sharing the channel measurement information in the cell by broadcasting; and by the terminal ID code based mode, transmitting and receiving the channel matrixes generated in the cell, where the channel matrixes are same. In addition, the main terminal process the terminal adding or exiting by monitoring the terminals in the cell in real time; thereby, the invention achieves channel matrixes dynamic updating result, and reduces the problem that the system is sensitive to the antenna order.
Description
Technical field
The present invention relates to the channel measurement technology of distributed MIMO district terminal room, wherein, the mode that each terminal is shared by channel information obtains channel matrix in this sub-district, specifically relates to the channel matrix formation method of a kind of distributed MIMO district multi-hop refile
Background technology
MIMO (Multiple-Input-Multiple-Output), i.e. multi-input multi-output system.The MIMO technology can improve capacity and the antijamming capability that has wireless/mobile communication system now exponentially, but in order to obtain the independence of mimo channel, generally require spacing between transmitting antenna or the reception antenna greater than 1/4 wavelength distance of working frequency range signal, therefore not too be suitable for frequency and be lower than the following portable terminal of 1GHz.In the application of single antenna, after using advanced coding techniques, message transmission rate is the convergence shannon limit.But, to accomplish that for existing portable terminal many antennas are also unrealistic because of many unfavorable factors such as size of mobile terminals, power consumption, costs.These reasons have limited the large-scale application of MIMO technology at wireless terminal.Therefore, people use for reference the relaying and the cooperative communication thought of multi-hop wireless Ad Hoc network, to the MIMO technology particularly the distributed MIMO technology expand, make it to adapt to end side, virtual MIMO technology has been proposed.This technology is expected to obtain the benefit of MIMO technology, and therefore easier realization is subjected to extensive concern.
In virtual MIMO technology, the MIMO technology still is applied, but is not to indiscriminately imitate fully.Because, in the MIMO technology, send (perhaps receiving) antenna and all be under the jurisdiction of same terminal, the channel matrix acquisition that needs in the signals transmission, Frequency Distribution, signal are compiled (separating) sign indicating number and are all finished in the processing unit of same terminal, but in virtual MIMO, each antenna all is independently and belongs to different terminals, correspondingly, originally the technology of using in the MIMO technology just need be made and improving even renewal fully, could be fit to new application scenario.In all problems mainly be each independently terminal how to obtain channel matrix? in virtual MIMO, the decoding of spectrum allocation may and sending and receiving end all needs to use channel information.And, be based upon the virtual MIMO technology on the spaced antenna basis, to send sub-district and the transmitting terminal and the receiving terminal that receive in the original MIMO technology of sub-district (comprising the relay sub-district) replacement, need channel information equally.Therefore, the technology of acquisition channel matrix is a key technology in virtual MIMO.
In the tradition MIMO technology, the signal transmission is very responsive to the antenna exponent number of system.For using MIMO technique in virtual MIMO promotes transmission capacity, and avoid because the separate channel matrix that brings of terminal antenna forms difficulty, the present invention is given in a kind of channel matrix acquisition technology under the virtual MIMO application scenario from the angle of cross-layer optimizing and information interaction.
Summary of the invention
Problem to be solved by this invention is: how a kind of channel matrix formation method that dynamically updates channel matrix, minimizing system to the distributed MIMO district multi-hop refile of antenna exponent number sensitivity is provided.
Technical problem proposed by the invention is to solve like this: the channel matrix formation method of a kind of distributed MIMO district multi-hop refile may further comprise the steps:
A), finish the initialization of channel measurement between the communication cell;
B), initiate channel measurement, receive the terminal feedback information that terminal in the sub-district is received to be needed behind the measuring-signal in the transmission sub-district, be used for carrying out channel estimating by the terminal terminal in receiving the sub-district that sends in the sub-district;
C), the terminal of transmitting-receiving in the sub-district obtain metrical information, terminal has been carried out channel estimating, after transceiver terminal formed channel estimation value, beginning is shared this channel information in this sub-district;
D), after terminal receives the channel information of other-end in this sub-district, form the channel information matrix with self measured channel information;
E), the master terminal in each sub-district is responsible for whether having terminal to add or withdraw from the situation of communication in the monitoring sub-district in real time, determines the subsequent operation step then.
Finish the initialization of channel measurement described in the step a) between the communication cell, the master terminal of promptly receiving and dispatching in the sub-district is finished communication information preparation in the sub-district separately, comprises that id number sends, terminal channel is measured time started and duration etc.; Subsequently, finish information interaction between the master terminal to obtain the communication information needed; Master terminal need broadcasted the other side's cell communication information that obtains in the sub-district separately, and coordinates terminal and carry out channel measurement in case Communication Jamming.
Shared channel information described in the step c) is meant the channel information that terminal can ask the transmission of neighbours' terminal oneself to lack.
Behind the channel information of this sub-district other-end that terminal is received in the step d), form transmitting-receiving cell channel matrix, the internal data of this channel matrix rule ordering is by appointment arranged, so this channel matrix is identical in this sub-district.
Master terminal needs in real time terminal in this sub-district to be detected in the step e), and withdrawing from or add according to terminal, broadcast in the transmitting-receiving sub-district: when terminal withdraws from this sub-district, notify and withdraw from the pairing channel information of terminal in the terminal deletion channel matrix in this sub-district, and send message by the master terminal of master terminal in adjacent sub-district; Subsequently, master terminal notifies in this sub-district terminal similarly to delete respective channel information in the adjacent sub-district.
Also comprise the operating procedure for multi-hop relay cell communication, be in the status that sends the sub-district as the reception sub-district of upper level in next level communications, then the operation that need carry out of this transmission sub-district has:
L), finish the initialization of channel measurement between the communication cell;
M), initiate channel measurement by the terminal terminal in next stage receives the sub-district that sends in the sub-district;
N), after the terminal of transmitting-receiving in the sub-district obtain metrical information, beginning is shared this channel information in this sub-district;
O), after terminal receives the channel information of other-end in this sub-district, form the channel information matrix with self measured channel information;
P), the master terminal in each sub-district is responsible for whether having terminal to add or withdraw from the situation of communication in the monitoring sub-district in real time, determines the subsequent operation step then.
Described step l) initialization of finishing channel measurement between the communication cell is meant that the master terminal of receiving and dispatching in the sub-district finishing communication information preparation in the sub-district separately, comprises id number transmission, terminal channel measurement time started and duration etc.; Subsequently, finish information interaction between the master terminal to obtain the communication information needed; Master terminal need broadcasted the other side's cell communication information that obtains in the sub-district separately, and coordinates terminal and carry out channel measurement in case Communication Jamming.
Step m)～step o) in also comprise and receive the terminal feedback information that terminal in the sub-district is received to be needed behind the measuring-signal in the transmission sub-district, be used for carrying out channel estimating; Terminal has been carried out after the channel estimating, after transceiver terminal forms channel estimation value, and shared channel information in this sub-district; Terminal can be asked the channel information of neighbours' terminal transmission oneself disappearance; Behind the channel information of this sub-district other-end that terminal is received, form transmitting-receiving cell channel matrix, the internal data of this channel matrix rule ordering is by appointment arranged, so this channel matrix is identical in this sub-district.
Step p) master terminal needs in real time terminal in this sub-district to be detected in, and withdrawing from or add according to terminal, broadcast in the transmitting-receiving sub-district: when terminal withdraws from this sub-district, notify and withdraw from the pairing channel information of terminal in the terminal deletion channel matrix in this sub-district, and send message by master terminal master terminal in adjacent sub-district; Subsequently, in addition in the sub-district master terminal notify in this sub-district terminal similarly to delete respective channel information.
Add terminal and need obtain the master terminal approval, the adding terminal after the approval needs complete operation as follows:
Q), finish the initialization of channel measurement between the communication cell;
R), add terminal terminal in receiving the sub-district and initiate channel measurement;
S), send terminal in the sub-district and obtain metrical information after, beginning is shared this channel information in this sub-district;
T), terminal is upgraded channel matrix voluntarily in the reception sub-district;
U), add after terminal receives the channel information of other-end in this sub-district, form the channel information matrix together with own measured channel information;
V), whether the master terminal in each sub-district be responsible in real time having terminal to add in the monitoring sub-district or withdrawing from communication, determines whether initiate new channel measurement at the terminal that changes then.
In sum, operation principle of the present invention is:
At first, communicate between the master terminal, obtain the required parameter of channel measurement.Subsequently, master terminal is broadcasted the messaging parameter that obtains in this sub-district, carry out initialization operation.
After initialization was finished, terminal was carried out channel measurement.Communicating pair is by existing channel measurement technology and feedback system channel measured value.Need to prove that the terminal that sends in the sub-district need be carried out channel measurement with all terminals that receive in the sub-district.
Terminal obtains to form the channel value vector after the channel measured value, and this vector is shared in this sub-district.When the channel value of all terminals was vectorial in terminal does not obtain this sub-district, it can send request to the master terminal in this sub-district or neighbours' terminal, to obtain the channel value vector.
After terminal obtained all channel value vectors, the ordering by regulation generated channel matrix in the sending and receiving end, and to change matrix be identical in this sub-district.
In order to tackle the situation that terminal adds or withdraws from, master terminal needs to monitor in real time terminal variation in this sub-district, and takes corresponding strategy so that channel matrix dynamically updates.
The present invention is by the mode based on the Termination ID number, and terminal generates channel matrix in the transmitting-receiving sub-district, and this channel matrix is identical; In addition, master terminal is by to the real-time monitoring of terminal in the sub-district, terminal added or withdraws from and handle it, thereby reach the effect that dynamically updates channel matrix, and the minimizing system is to antenna exponent number sensitive issue.
Description of drawings
The wireless dummy MIMO communication system figure that Fig. 1 is applied to for the embodiment of the invention;
Fig. 2 wireless terminal general protocol stack structure chart
Fig. 3 is the simple flow chart of implementation procedure of the present invention;
Fig. 4 finishes the flow chart of initial operation for terminal in the sub-district;
Fig. 5 is that terminal is to finish the data format that initialization operation sends;
Fig. 6 is the data format that sends when terminal shared channel value is vectorial in the sub-district;
Flow chart when Fig. 7 finishes channel measurement for terminal;
The flow chart that Fig. 8 finishes the channel matrix renewal and terminal variation in the sub-district is operated for terminal;
Embodiment
Below in conjunction with accompanying drawing the present invention is further described:
In the explanation hereinafter,, set forth the details that some the present invention realize, so that provide to overall understanding of the present invention for the purpose of explaining rather than limiting.But the present invention also can be realized by other embodiment that possesses similar details or device.Wireless dummy MIMO communication system is made of the communication cell of plurality of cascaded, and promptly one comprises the cell-of-origin of source terminal, the purpose sub-district that comprises the purpose terminal, relay sub-district, and several relay sub-districts.For specifying, only sending with receiving the sub-district with one-level among the embodiment is example.But the inventive method is equally applicable to the channel measurement of multistage relay sub-district.
Fig. 1 is the wireless dummy MIMO communication system figure that the embodiment of the invention is used.As shown in Figure 1, wireless dummy MIMO communication system is made up of communication terminal and communication cell.Wherein, source terminal in cell-of-origin (or sending the sub-district) and purpose sub-district (or receiving the sub-district) and purpose terminal are called and send sub-district master terminal 102, receive sub-district master terminal 104, and other-end is referred to as general terminal 103.Under multistage cell conditions, when setting up in the sub-district, relay sub-district master terminal selects.
Terminal is the mobile device that possesses radio communication function.Master terminal is the main body of communication, is responsible for initiating the sub-district and sets up and the channel measurement initialization.Communication between the master terminal is the process of information from the source to the purpose.Other-end in the sub-district is to participate in communication and form the virtual MIMO effect with master terminal.
Terminal puppy parc stack architecture as shown in Figure 2.Realization of the present invention mainly relies on the information interaction between MAC layer and the physical layer.
Fig. 3 is the flow chart of virtual MIMO minizone channel measurement.According to this flow chart, terminal can finish channel measurement and channel upgrades.Step of the present invention is: initialization 201; Channel measurement 202; Channel information shares 203 in the sub-district; Channel information process 204; With renewal channel information 205.Fig. 4 subsequently will describe terminal in detail to Fig. 8 and how be implemented in the measurement of realization channel matrix under the virtual MIMO system and the renewal of channel matrix.
Fig. 4 is the initial work before the channel measurement.During initialization, terminal must be in idle condition 301 just can join channel measurement communication.When terminal is received communication request 302, need make a response to this.At this moment, receive that the terminal of communication request and the terminal of sending request to it all are the main bodys of direct communication, be in the master terminal status.Then, send the communication cell request 303 of setting up to neighbours' terminal, and set up communication cell by master terminal.This step comprises that also master terminal obtains Termination ID number in the communication cell of place simultaneously.Then, Termination ID number 304 in the mutual sub-district, place between the master terminal is so that communication measurement between the terminal subsequently.The master terminal that has obtained Termination ID number in the other side sub-district is broadcasted the id number 305 that obtains in this sub-district.
The data frame format that Fig. 5 is adopted when this Cell Broadcast CB the other side cell terminal id number for master terminal, wherein content comprises: terminal number 401 to be measured, Termination ID sequence vector 402 to be measured, this cell terminal ID sequence vector 403, measurement time started 404, the each measurement continue maximum time 405.Other-end in the sub-district can obtain other-end id number in this sub-district by receiving this Frame, so that channel information is shared; Can obtain Termination ID number in the other side sub-district, so that channel measurement; Measurement time started 404 that obtains and each the measurement continue maximum time 405, can help terminal reasonably to launch communication measurement.In addition, the phase mutual interference during for fear of communication measurement between the terminal, terminal begins channel measurement according to the id number order.
Fig. 6 for terminal at the data frame format that records behind the channel information when in this sub-district, sharing.Other id numbers in the ID of id number 401 ' can be oneself or this sub-district.Id number 401 ' after channel information vector 402 ' then corresponding have a measured channel information vector of id number 401 ' terminal.That is to say that single terminal can have the channel information vector of a plurality of other-ends.Need the channel measurement information vector of specific ID number institute counterpart terminal as terminal after, have these vectorial terminals and only need in Frame, add id number and corresponding channel information vector thereof, and send to purpose terminal in this sub-district.
According to said method, the master terminal 1 among Fig. 1 (terminal below label) is initiated communication request to master terminal 4.Subsequently, two master terminals initiate to set up cell signal separately, set up to send sub-district 101 and receive sub-district 105.Send the sub-district and comprise terminal 2 and terminal 3, receive the sub-district and comprise terminal 5 and terminal 6.Master terminal 1 subsequently with the mutual sub-districts separately of master terminal 4 in Termination ID number (, replacing id number) with terminal below label for ease of describing.Then, master terminal 1 and the Termination ID number of master terminal 4 in the other side sub-district that Cell Broadcast CB obtained separately.The content of broadcasting except terminal number to be measured and Termination ID to be measured, also comprises this cell terminal ID sequence vector 403, measures time started 404 and each the measurement lasting maximum time 405 as shown in Figure 5.This cell terminal ID sequence vector 403 is correctly not obtain under the prerequisite of all channel measurement vectors in order to have in terminal, uses when sharing by terminal request channel information in this sub-district.Measure the time started 404 and each the measurement continues 405 of maximum times and stipulated that each terminal begins the time of channel measurement and carries out the maximum time that channel measurement can take.Each terminal channel measurement time started can begin according to the id number order.
After initial work was finished, terminal entered the channel measurement stage, as shown in Figure 7.Terminal at first judges whether to be the communication initiator, makes corresponding operating then.If terminal is communication initiator's (is in and sends in the sub-district), terminal is initiated channel measurement 504, terminal in the reception sub-district is measured successively, and be provided with the overtime judgment mechanism of measurement (mainly being always to take valuable communication channel resources for fear of measuring); If terminal be recipient's (is in reception sub-district in), the terminal wait channel measurement 503 of making a start.If receive the measuring-signal of making a start, receiving terminal is to measuring terminals feedback signal 509; After aforesaid operations was finished in the sending and receiving end, the channel measurement step finished.
After the terminal channel measurement is finished, form the channel information vector:
K is for sending terminal serial number in the sub-district, M
RFor receiving the terminal number in the sub-district, each element is terminal k and receives the channel information between the terminal in the sub-district in the vector.Terminal 2 as shown in Figure 1, and after finishing channel measurement, the channel information vector of formation is:
After the channel measurement of all terminals in the sub-district was finished, terminal entered shared 203 steps of channel information in the sub-district.Terminal is given terminal in this sub-district channel information broadcasting share separately in the sub-district, and the data frame format of use as shown in Figure 6.If terminal is not received all channel informations in Channel Sharing, can send request to neighbours' terminal, require neighbours to transmit the channel measurement information of oneself not receiving.
In channel information process 204 steps, terminal is arranged in order all channel informations of receiving according to id number order from big to small.According to the inventive method, all terminals form channel matrix in the sub-district.The channel matrix that terminal forms in the transmission sub-district shown in Fig. 1,2 is as follows:
Because the changeable particularity of wireless communications environment, itself all can change channel that terminal communication is used or terminal.So the present invention is directed to this situation, require the real-time monitor cell channel measurement of master terminal situation, the specific implementation flow process is seen Fig. 8.The terminal adding may occur or withdraw from the sub-district.
As shown in Figure 1, when adding sub-districts 101 as if terminal 7, master terminal 1 carries out information interaction 604 with this terminal and whether decision allows new terminal adding sub-district.Allow, master terminal is to new terminal transmission data frame format as shown in Figure 5, and then new terminal carries out channel measurement step 202 (also being 609), and after measuring, the channel information of terminal 7 broadcasts 608 in the sub-district.Upgrading in the channel information operation 607 in the sub-district separately at subsequently communicating pair, sub-district 105 is because the channel measurement of terminal 7 has as a result upgraded channel matrix automatically.In the sub-district 101, master terminal 1 sends existing channel matrixes so that channel matrix upgrades to new terminal 7, and other-end upgrades channel matrix after receiving the channel information of new terminal 7 automatically.Be equivalent in the new delegation of formula (2) lining adding.
If terminal 3 withdraws from sub-district 101, then master terminal is broadcasted this message and notifying cell 105 (605) in this sub-district, in operation 607, and the channel information of terminal deletion terminal 3 correspondences in the sub-district.In sub-district 101, be equivalent to delete the third line, correspondingly the 3rd row of the terminal deletion in sub-district 105.
The foregoing invention method only is used between the two-stage cell communication in the present embodiment, but this method is suitable between the multistage cell communication equally.In this way, the reception sub-district shown in Fig. 1 is changed the role who sends the sub-district into, and its next stage sub-district becomes the reception sub-district, method therefor among the formation method of channel matrix such as the present invention, thus the channel matrix that has formed the multi-hop refile forms scheme.
Claims (10)
1, the channel matrix formation method of a kind of distributed MIMO district multi-hop refile is characterized in that: may further comprise the steps:
A), finish the initialization of channel measurement between the communication cell;
B), initiate channel measurement, receive the terminal feedback information that terminal in the sub-district is received to be needed behind the measuring-signal in the transmission sub-district, be used for carrying out channel estimating by the terminal terminal in receiving the sub-district that sends in the sub-district;
C), the terminal of transmitting-receiving in the sub-district obtain metrical information, terminal has been carried out channel estimating, after transceiver terminal formed channel estimation value, beginning is shared this channel information in this sub-district;
D), after terminal receives the channel information of other-end in this sub-district, form the channel information matrix with self measured channel information;
E), the master terminal in each sub-district is responsible for whether having terminal to add or withdraw from the situation of communication in the monitoring sub-district in real time, determines the subsequent operation step then.
2, the channel matrix formation method of distributed MIMO district multi-hop according to claim 1 refile, it is characterized in that: finish the initialization of channel measurement described in the step a) between the communication cell, the master terminal of promptly receiving and dispatching in the sub-district is finished communication information preparation in the sub-district separately, comprises that id number sends, terminal channel is measured time started and duration etc.; Subsequently, finish information interaction between the master terminal to obtain the communication information needed; Master terminal need broadcasted the other side's cell communication information that obtains in the sub-district separately, and coordinates terminal and carry out channel measurement in case Communication Jamming.
3, the channel matrix formation method of distributed MIMO district multi-hop according to claim 1 refile is characterized in that: the shared channel information described in the step c) is meant the channel information that terminal can ask the transmission of neighbours' terminal oneself to lack.
4, the channel matrix formation method of distributed MIMO district multi-hop according to claim 1 refile, it is characterized in that: behind the channel information of this sub-district other-end that terminal is received in the step d), form transmitting-receiving cell channel matrix, the internal data of this channel matrix rule ordering is by appointment arranged, so this channel matrix is identical in this sub-district.
5, the channel matrix formation method of distributed MIMO district multi-hop according to claim 1 refile, it is characterized in that: the master terminal needs detect terminal in this sub-district in real time in the step e), and withdrawing from or add according to terminal, broadcast in the transmitting-receiving sub-district: when terminal withdraws from this sub-district, notify and withdraw from the pairing channel information of terminal in the terminal deletion channel matrix in this sub-district, and send message by the master terminal of master terminal in adjacent sub-district; Subsequently, master terminal notifies in this sub-district terminal similarly to delete respective channel information in the adjacent sub-district.
6, the channel matrix formation method of distributed MIMO district multi-hop according to claim 1 refile, it is characterized in that: also comprise operating procedure for multi-hop relay cell communication, be in the status that sends the sub-district as the reception sub-district of upper level in next level communications, then the operation that need carry out of this transmission sub-district has:
L), finish the initialization of channel measurement between the communication cell;
M), initiate channel measurement by the terminal terminal in next stage receives the sub-district that sends in the sub-district;
N), after the terminal of transmitting-receiving in the sub-district obtain metrical information, beginning is shared this channel information in this sub-district;
O), after terminal receives the channel information of other-end in this sub-district, form the channel information matrix with self measured channel information;
P), the master terminal in each sub-district is responsible for whether having terminal to add or withdraw from the situation of communication in the monitoring sub-district in real time, determines the subsequent operation step then.
7, the channel matrix formation method of distributed MIMO district multi-hop according to claim 6 refile, it is characterized in that: the initialization of finishing channel measurement in the described step 1) between the communication cell is meant that the master terminal of receiving and dispatching in the sub-district finishing communication information preparation in the sub-district separately, comprises id number transmission, terminal channel measurement time started and duration etc.; Subsequently, finish information interaction between the master terminal to obtain the communication information needed; Master terminal need broadcasted the other side's cell communication information that obtains in the sub-district separately, and coordinates terminal and carry out channel measurement in case Communication Jamming.
8, the channel matrix formation method of distributed MIMO district multi-hop according to claim 6 refile, it is characterized in that: step m)～step o) in also comprise and receive the terminal feedback information that terminal in the sub-district is received to be needed behind the measuring-signal in the transmission sub-district, be used for carrying out channel estimating; Terminal has been carried out after the channel estimating, after transceiver terminal forms channel estimation value, and shared channel information in this sub-district; Terminal can be asked the channel information of neighbours' terminal transmission oneself disappearance; Behind the channel information of this sub-district other-end that terminal is received, form transmitting-receiving cell channel matrix, the internal data of this channel matrix rule ordering is by appointment arranged, so this channel matrix is identical in this sub-district.
9, the channel matrix formation method of distributed MIMO district multi-hop according to claim 6 refile, it is characterized in that: the master terminal needs detect terminal in this sub-district in real time step p), and withdrawing from or add according to terminal, broadcast in the transmitting-receiving sub-district: when terminal withdraws from this sub-district, notify and withdraw from the pairing channel information of terminal in the terminal deletion channel matrix in this sub-district, and send message by master terminal master terminal in adjacent sub-district; Subsequently, in addition in the sub-district master terminal notify in this sub-district terminal similarly to delete respective channel information.
10, according to the channel matrix formation method of claim 5 or 9 each described distributed MIMO district multi-hop refiles, it is characterized in that: add terminal and need obtain the master terminal approval, the adding terminal after the approval needs complete operation as follows:
Q), finish the initialization of channel measurement between the communication cell;
R), add terminal terminal in receiving the sub-district and initiate channel measurement;
S), send terminal in the sub-district and obtain metrical information after, beginning is shared this channel information in this sub-district;
T), terminal is upgraded channel matrix voluntarily in the reception sub-district;
U), add after terminal receives the channel information of other-end in this sub-district, form the channel information matrix together with own measured channel information;
V), whether the master terminal in each sub-district be responsible in real time having terminal to add in the monitoring sub-district or withdrawing from communication, determines whether initiate new channel measurement at the terminal that changes then.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883075A (en) * | 2010-07-05 | 2010-11-10 | 电子科技大学 | Cooperative transmission method based on virtual MIMO (Multiple Input Multiple Output) system |
| WO2015184915A1 (en) * | 2014-08-25 | 2015-12-10 | 中兴通讯股份有限公司 | Signalling transmission method and device for multiple-input multiple-output system |
| CN103813344B (en) * | 2012-11-12 | 2017-06-20 | 中国移动通信集团浙江有限公司 | A kind of interference matrix establishment method and system |
-
2009
- 2009-02-23 CN CNA2009100584026A patent/CN101494920A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883075A (en) * | 2010-07-05 | 2010-11-10 | 电子科技大学 | Cooperative transmission method based on virtual MIMO (Multiple Input Multiple Output) system |
| CN101883075B (en) * | 2010-07-05 | 2012-11-14 | 电子科技大学 | Cooperative transmission method based on virtual MIMO (Multiple Input Multiple Output) system |
| CN103813344B (en) * | 2012-11-12 | 2017-06-20 | 中国移动通信集团浙江有限公司 | A kind of interference matrix establishment method and system |
| WO2015184915A1 (en) * | 2014-08-25 | 2015-12-10 | 中兴通讯股份有限公司 | Signalling transmission method and device for multiple-input multiple-output system |
| US10511366B2 (en) | 2014-08-25 | 2019-12-17 | Zte Corporation | Signaling transmission method and device for multiple-input multiple-output system |
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